Ring-tensioning apparatus



F BAY.

RING TENSIONRNG APPARATUS.

APPLlcAmN FILED 00h16, 1918.

, 1,332,573, Patented 15131121920.

A f i itH irai) srarns Param orricn.

FREDERICK RAY, OF-S\HORT HILLS, NEW JERSEY.

RING-TENSIONING APPARATUS.

Application filed October 16, 1918.

Vton rings for the purpose of setting up stresses therein which are distributed in amoiint or location so as to cause the rings when in use to exeit substantially uniform outward radial spring pressure at all points of their circumferences; and the object is to 'insure the application of the distributed stresses to the intended portions of each ring, so that the desired uniformity of action under working conditions may bel realized.

n machines wherein, for example, the rings are held and moved by a rotatable chuck, and acted upon by variable blow hammer mechanism, in accordance with a deii-' nite law, it is very desirable that an exact relation be established between the ring and the distribution of the hammering, as otherwise the resulting systemA of strains in the ring will be displaced, no portion receiving its proper tensioning. Under such conditions, the two halves of the ring, at opposite sides oi' the split or gap, will be unsymmetrically afected, as the result of which the ring cannot exert uniform pressure. The present in'- ventioii prevents this condition occurring and insures a symmetrical distribution of the hammering or stresses with respect to the gap in the ring. This is accomplished by the provision onor in the ring-holder of a lug located at the region of least hammering, where accordingly the gapdn the ring should be located in order to insure the proper application and distribution of stresses when the machine is set in operation. Best results are secured by forming the lug'as a movable, syinnietrically tapered or wedge-form centering member, mounted in a guide of definite location, and adapted to enter the ring gap and b v contact with both of the ring ends to register the ring` with reference to the mechanism, this centering or registration being` wholly independent of the amount of end clearance in the ring.' because of the seltadjusting character ot the wedge.

ln the accompanying drawings illustrating the invention:

Figure 1 is a fragmentary front elevationof a machine embodying the invention;

Specification of Letters atent.

Patented Mar. e, 192e.

seran no. 252,460.

2 is an enlarged vertical transverse section,

Fig. 3 is an enlarged perspective view illustJ 'ating the relation of the wedge to a diagonally cut or split ring;

Fig. 4e is a smaller view showingthe relation for a lap-joint ring; and

Figs. and 6 are semi-diagrammatic views itself to diiterent widths-of gap. For purposes of illustration the inventio has been shown applied to a hammering machine such as is disclosed in the Wasson Pat.

ent Yo.y 1,016,380, 'but it is tobe understood vthat it is not limited thereto or to the use of hammer means bodily movable for producing the tensioning, but may be used with rolling or other machines for introducing radial stresses into piston rings.

`While reference is intended to be had to the said T,"Vasson patent for a complete understanding of the illustrative mechanism, it may be briefiy sta-ted that the ring a is held in a removable ring seat 18, 2li, which is in turn held in a chuck body 16 mounted rotatably in circular opening in a support 13. Means for turning the chuck in a step-bystep manner is represented by a ratchet 25 iixed to the chuck body and a feed dog 26 cooperative therewith. The ring seat mem-v ber 18 is formed with the bottom of the ring seat and with one side shoulder, and the member 24 provides the `other side portion, the whole being removably clamped together and against a shoulder 19 on the chuck body, by .means of a screw ring 21.

A vertically movable hammer body 88,

having a striking portion 32 located over the,

ring seat, is raised and permitted to fall'by a tapered tripping` cam not shown), which is governed by a control ca1n'46 secured to the rotatable ring` chuck and acting upon the hammer mechanism through connections represented by the roller arm 48. In this way the force ot the blows is automatically varied upon the different portions of tlie ring. The shape of the control cam determines the law of the machine, and when the roller 4T ot the roller arm rests in the notch 82, the machine is at rest and/,in readiness to commence hammering at ari predetermined 'point in the ring, that is to'say at'tlie gap.

- showing how the ceiitralizing member adapts recess or chamber a plunger 52is mounted 'and guided, itsoperative end 53 being'symmetrically tapered or given a wedge-fo rm, to enter the gap b of the ring. A. compression spring 51, confined in the recess between a shoulder 55 on the plunger or eentralizing device and the plug 51, serves normally to hold the wedge. projected into the ring seat and to permit it to yield as much as may be necessary to accommodate itself to different widths ot gap, as indicated in Figs. 'and.

. Such variations in the 'gap necessarily result from slightfvariations in manufacture, and maybe corrected at a later stage in the production or' tlierings.

For the purpose of a removable ring seat, a deinite positioning of the centralizing device is secured by the provision of a pin 5G and a socket 57 onthe ring seat and chuck body respectively. In addition the cam 46 and the chuck 16 are made relatively adjustable in order that the cam and centering wedge may be set in precisely the proper relation. To this end the cam is secured to the chuck by screws 70 which pass through slotted openings 71 in the cam. The screws when' tightened hold the parts rigidly together, but may be loosened in order to permit slight relative turning movement, after which they are again tightened.

The edge of the centralizing Wedge should 'be presented in parallelism with the edges of the slot in the ring and should be kept from turning, for which purpose portions of the cooperative bearing surfaces of the plunger and recess are appropriately formed and the edge disposed in the proper relationv thereto. 'Fig represents the upper portion 58 of the pi Iniger, beneath the wedge' end, as square, and it will be understood that the corresponding part of the recess is similarly formed. For a diagonally cut ring, the edge .of the wedge'is also arranged diagonally. For asquare end ring or for a lap joint ring it should be disposed transversely, and in the latter instance it may be only half the width ot the ring seat. As

shown in the` drawings the edge or tip 59 of the wedge is made of a different and much narrower taper than the remainder of the head. rlfhis dii'erential'taper accommodates the centralizing device to a much wider range oi" end clearance variation than would a-single taper, and the narrow edge is particirlarly adapted to enter the gaps orings having a very narrow clearance. As seen in Fig. 5, the membermay be used with rings Ahavin practically no end clearance. y All that is necessary is tol bringone end of the ring against the member, and then to spring the other end into place, which will force the spring-pressed plunger outward until only its thin edge is between the ends.

What I claim as, new is:

1. In ring-tensioning apparatus, the combination with meansfor imparting stresses to a divided ring which stressesvary symvmetrieally in the two halves, vof a' yielding member adapted to enter the ring gap to centralize the same irrespective of the width of end clearance. l

2.- In a machine of the character described, the combination of a ring-holder, means for imparting stresses to a divided ring held therein, said stresses being predeterminedly varied in its diii'erent portions, and centralizing means for the ring operative in the gap of the ring.

3. A machine of the character described comprising a ring-holder, means for acting' upon a ring therein. with automatically varying force, said ring-holder having a recess at the ring-end region, and a movable cen.

tralizing wedge in said recess.

4. In ring-tensioning apparatus, the combination with means for. operating pon a divided ring with intensities varie symmetrically in the two halves,'of a part having a guide, and a movable centralizing member definitely located by said guide and having a tapered end adapted to. enter the gap of the ring.

5. A machine of the character described, comprising a ring-holder for holding a ring, means for rotating the same and means for imparting to different portions of the ring varying stresses, said ring-holder having a recess at the ring-end region, a tapered centralizing member guided in said recess, and a spring in the recess acting to project the member. y

6. In ring-.tensioning apparatus comprising means for operating upon a divided ring with intensitiesvaried symmetrically in the two halves, and a centralizing taper lug constructed with a differential taper having a broadly sloping body and a narrowly converging edge. A

7 In a machine of the character described, lthe combination of a ring-holder, means for imparting stresses to the ring, a control cam Jfor 'varying the stresses in the different parts of the ring in accordance with a predetermined law, and a lug on the ring-holder cooperative with the split portion of the ring to ccntralize it. f

In 'testimony whereof, I have signed my name to this speciticaticn. 

